Neutron scattering techniques have been used to investigate the magnetic structure of K2CoxF1-xF4 with x=0.2 and x=0.6. The x=0.6 sample exhibits only one magnetic phase transition, at TN=92.2+or-0.1K. The x=0.2 sample has two magnetic phase transitions; below TN=66+or-1K the axial spin components order, while below a well defined transition at TL=32+or-2K the transverse components also order. The spin wave dispersion relations have been measured for both samples using inelastic neutron scattering techniques.
Higgins, S. A., Couley, R. A., Hagen, M., Kjems, J., Dürr, U., & Fendler, K. (1984). An Investigation of the Magnetic Structure and Excitations in K2CoxFe1-xF4. Journal of Physics C: Solid State Physics, 17(18), 3235-3246. https://doi.org/10.1088/0022-3719/17/18/015